MacBook Air screen broken within 2 months of purchase

My screen is glitching. I went to the apple store and they told me it was a crack but I haven't dropped the computer at all since buying it. It's a new computer from 2 months ago. I have a warranty but not apple care. I don't understand why I'm having to pay when it was a defective laptop.

[Re-Titled by Moderator]

Original Title: Computer Broken within 2 months of purchase